Electrical wiring methods and materials have changed drastically since home wiring first began, and the National Electrical Code changes every three years. Most homes have had additional wiring added or changed after being built. And there are different acceptable wiring styles and material preferences among electricians of the same time period. There is no way for an electrician to know exactly what type of wiring methods, styles, and materials are in your home without a visit to your home. Each home's floor plan, size, foundation style, and attic accessibility is different than the next. All these variables come in to play when calculating the price to do any type of electrical work. Without knowing these variables, it is just not possible to give you an accurate price to do your work.